In some cultures it's considered a compliment to be called fat. Definately not ours and the original poster didn't say this guy was from another country so I'm assuming he's a home grown jerk who doesn't pay attention. (Oops
, I'm letting a little of my personal feelings out....better stop)
My dh had a friend from his home county that would visit us occasionally, each time he came he would say, "My you're looking very fat." After the third time, I asked him if he was planning on staying in the US. He said yes,
"well, let me tell you something. Do not say to anyone they look fat. I don't care if they are as big as a house and have put on a 100 pounds since the last time you've seen them." He was very apologetic and went on and on about how in his country it was a compliment because it meant you were prosperous to have more then enough food. Later he asked me what he should say to a hostess when he visited... I gave him a list of polite things to say, we actually went over several common questions/statements from his country that I had to flinch when I heard.
Sarah